Counter Pressure Transfer

[Hsuan-Tso Shen]

Hi All
I am doing the counter pressure transfer from the Keg to the Plastic bottle couple days before. I open the plastic bottle today, and found the bubble is not as much as the keg one. I would like ask for the help what's the problem.
The method which I did the counter pressure transfer are as follows.

1. Cold the keg to 0-6 degree C
2. Fill the bottle with carbon dioxide to 7-8 psi
3. Assembled the gas line to keg, and pressure to 15 psi
4. Assemble the liquid line to keg and plastic bottle
5. My gas relief valve will release the gas around 14-15 psi ;Beer will flow from keg to plastic bottle

So, I am thinking about if the step 2 process is too low for this counter pressure process, the beer is loss the bubble.

If it is correct, I am thinking about to increase the step 2 pressure to 14 PSI (Just under the gas relief valve pressure), and run whole of the processes.

Do you think that it can be improved?

Thanks !!

 

[DuncB]

I fill my receiving keg with Starsan, then purge that using late ferment gas. Then when empty use a spunding valve on the fermenter and keg to hit a target pressure.
Then I basically follow this procedure. Remember gravity is your assistant and purge all those beer and gas lines before the process.

 

[James_AZ]

What I do to not lose CO2 in solution during transfer is to set the pressure on the source higher than what it has been stored/carbonated too. Then set the transfer vessel to the desired pressure.

So if my carbonation level was 15PSI on the source keg, i’d set it to 17 PSI for transfer. Then set the bottle pressure to 15PSI. Then when done transferring I set the source back to 15PSI.

 

[Drinking Sensibly]

I think the likely answer is the cap on the bottle let gas out. Not tight enough or damaged.

 

[DuncB]

What I do to not lose CO2 in solution during transfer is to set the pressure on the source higher than what it has been stored/carbonated too. Then set the transfer vessel to the desired pressure.

So if my carbonation level was 15PSI on the source keg, i’d set it to 17 PSI for transfer. Then set the bottle pressure to 15PSI. Then when done transferring I set the source back to 15PSI.

You can put a little pressure extra to starting pressure in your fermenter at the start. But the closed loop means you don't need to have the CO2 bottle attached or use supplementary gas at all.
Watch the video and you'll see.